Pistol Nebula
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The Pistol Nebula surrounds one of the most massive stars known, the Pistol Star. Both are located 25,000 light years away from Earth, near the center of the Milky Way galaxy. The nebula contains approximately 10 solar masses worth of ionized gas that was ejected by the star several thousand years ago. The nebula was named in the 1980s for its shape as seen in low resolution images that were available at the time.